And he believed in the Lord; and he counted it to him for righteousness. Genesis 15:6
God told Abram not to fear. I’m going to protect you and reward you. But Abram wondered what good is the blessings when he didn’t have an heir. God reassures him that an heir shall come forth out of thine own bowels and that his descendants will be like the stars too many to count. God already knows what we don’t have and he also knows what we are in need of.
Now unto him that is able to do exceeding abundantly above all that we can ask or think, according to the power that worketh in us Ephesians 3:20. And that scripture is forever so true, God tells Abram, For me, behold, my covenant is with thee, and thou shalt be a father of many nations. And I will make thee exceeding fruitful, and I will make nations of thee, and kings shall come out of thee, Genesis 17:4, 6. He is letting Abram know I’m going to do more than give you an heir.
God will always do what he said he is going to do. And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him, Genesis 17:19. But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year, Genesis 17:21. Four chapters later, For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him. And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac, Genesis 21:2-3.
He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God: And being fully persuaded that, what he had promised, he was able also to perform, Romans 4:20-21.
We can trust in God’s promises because God keeps his word and Psalm 138:2 says for thou has magnified thy word above all thy name. God is pure, holy, all powerful, all knowing, good, and truth and therefore so is his Word.
Jeremiah 1:12 NIV The Lord said to me, “You have seen correctly, for I am watching to see that my word is fulfilled.